If you bring home $3,800 a month and work 40 hours a week, instinct says an hour of your time is worth about $22. But that figure misses two things. First, getting to work costs money — gas or a transit pass, lunches out, clothes you wouldn’t buy otherwise. Second, the job takes more hours than your contract says: the commute, the time to get ready, the overtime nobody pays for. Subtract the first and add the second, and a smaller, more honest number appears: your real hourly wage.
The idea comes from Your Money or Your Life by Vicki Robin and Joe Dominguez: money isn’t the goal, it’s what you get in exchange for your life energy — the hours you spend earning it. Knowing what an hour is really worth lets you look at a purchase with clearer eyes.
How it works
It’s a simple division, but between the right numbers. Everything is put on the same period — here, all monthly:
real hourly wage = (take-home pay − work-related costs) ÷ real hours the job takes
“Real hours” are your contractual hours plus the hidden ones, scaled to a month (an average week is 52 ÷ 12 ≈ 4.33 weeks a month). “Work-related costs” are only what you spend because you work: if you stayed home, you wouldn’t spend them.
An example
Take the values already filled in above. You earn $3,800 take-home a month, and your contract says 40 hours a week. But each week you add roughly 7.5 hours of commute and prep, and you figure about $500 a month in work-related costs — gas, lunches, a few work clothes. Here’s the comparison:
- pay over contract hours alone comes to about $22 an hour — the number in your head;
- but the real hours are almost 206 a month, and what’s left after costs is $3,300;
- so your real hourly wage is about $16 an hour.
More than a quarter less. And here’s where it gets interesting: a $400 purchase doesn’t cost you $400, it costs you about 25 hours of your real life — more than half a week of actual work.
The part that matters
This tool isn’t here to depress you about your pay, and it isn’t telling you to stop spending. It’s here to change the question: not “can I afford it?” but “is it worth the hours of life it costs me?” There’s good evidence the shift is healthy — research across six studies and four countries found that people who spend money to free up their time report greater life satisfaction. Three honest things to keep in mind:
- It’s an estimate, and the numbers are yours. Costs and hidden hours vary from person to person: someone who works nearby and packs lunch has a real wage close to the nominal one; someone driving an hour each way twice a day watches it collapse. Use your numbers, not the example’s.
- The result can go negative. If work-related costs outrun what you bring in — which happens with a far-flung second job, or part-time work that forces a car and paid services — an hour costs you instead of paying you. The tool doesn’t hide that; it shows it in red, because that’s exactly the information you need.
- Count the right hours, not all of them. The idea is to include time you spend because of the job. The commute, yes; the gym hour you’d do anyway, no. It stays an estimate, but the more honest you are, the more useful the number.
Change the values above to match your own — pay, real hours, costs, and maybe the price of something you’re weighing — and watch what an hour of your time is really worth, and how many hours of life that purchase asks of you.